This is a cooperative learning assignment with manipulative and technology aspects. The students are to create "constants of proportionality" given certain information. If you don't have access to classroom computers or to a computer lab, there is an insert to the activity just for you!
The actual document is an MS Word doc so you can make changes in it as you wish. The assignment was originally centered around 7.RP.2b but does have extensions to 7.RP.2c and 7.RP.2d also.
Each color page is followed by a black line master.